argh ... I wish people would RTFRFC

So here we have

    20040907-21:41:31 mengwong(_at_)dumbo:~% dnstxt bluebottle.com
    v=spf2.0/pra a:209.223.237.194 a:209.223.237.195 mx -all

Setting aside the spf2 vs spf1 thing for now, I'm somewhat
dismayed to see people doing a:1.2.3.4 when the correct
syntax is ip4:1.2.3.4.

Should we change the spec to say that if the argument to an
"a" mechanism is obviously an IP address, we interpret it as
ip4 / ip6?